Question

2. Investigate the necessary user requirements for the transaction system.

Answer 1

Answer:

Necessary user requirements for the transaction system:

I am writing here about functional requirement for sales transaction system in the form of SRS document.

Functional Requirements

1. Retrieve name and price of good

Name - retrieve name and price of good

Description Input - Barcode

Output -  Name and price of product

Action - Access backend catalogue system and given barcode find and retrieve product description

Pre-condition - Valid barcode (consistent with standard + corresponding product exists)

Post-condition - Price and name of product available

2. Handle payment cash:

Name - Handle payment cash

Description Input - Amount to be paid, cash received

Output - Change to be given

Action - If result ok, Add amount to be paid to total amount of cash

Pre-condition - Cash received >= amount to be paid

Post condition - Amount of cash (after payment) = amount of cash (before payment) +amount to be paid

3. Deduce stock amount

Name - deduce stock amount

Description Input - Barcode

Output - Stock amount after this sale

Action - Deduce one from stock amount of product

Pre-condition - Valid code, at least one product in stock

Post-condition - ProductstockAmount_after == ProductstockAmountbefore -1

4. Handle coupon

Name - Handle coupon

Description Input - Coupon (id of coupon, id of promotion, id of product)

Output - Discounted price for product

Action - Read bar code on coupon , find id of coupon, retrieve name of promotion and id of product, verify that promotion is still valid, verify that product is available, retrieve discount rate

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